I'm trying to bind DataColumn Header to DynamicResource using following code.
<Window.Resources>
    <sys:String x:Key="HeaderText">Header Text</sys:String>
</Window.Resources>
<Grid>
    <tk:DataGrid>
        <tk:DataGrid.Columns>
            <tk:DataGridTextColumn Header="{DynamicResource HeaderText}" Width="100"/>
        </tk:DataGrid.Columns>
    </tk:DataGrid>
</Grid>
But for some strange reason column header remains empty. StaticResource however works well. Could you please help me to figure out how to bind that Header property to some DynamicResource.